Anti‐CD3/CD28‐activated purified CD3+ T cells were stained with a CFSE Cell Division Tracking Kit (BioLegend, San Diego, CA, USA), and they were exposed to different groups of CMs for 5 days. On day 5, the cells were harvested, and the percentage of proliferating cells was assessed by CFSE fluorescent staining and analysed by flow cytometry.
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